Did Microsoft sabotage its much-vaunted ODF compatibility in its latest patch release to Microsoft Office so that it could claim to be compatible with other vendors' products (and OpenOffice) but in fact be utterly unable to share documents with them?
That's the thoroughly documented implication of An Antic Disposition: Update on ODF Spreadsheet Interoperability.
Of course, it's hard to believe that an ethical company would do anything of the sort, damaging its own customers in order to inflict pain on its rivals. No, no ethical company would do that on purpose. Must be an accident ….